<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <span style="background-color: red; height: 100px; width: 100px; display: block">aaa</span>
    <div style="background-color: red; height: 100px; width: 100px; display: inline">aaa</div>
    <div style="background-color: red; height: 100px; width: 100px; display: inline">aaa</div>
    <span style="background-color: red; height: 100px; width: 100px; display: inline-block ">aaa</span>

</body>
</html>